Phosphoric Acid Esters Detection Tubes 0.05/a (0.05 ppm)

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Item #: 6728461
MFG: Draeger
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Phosphoric Acid Esters Detection Tubes 0.05/a (0.05 ppm)

Short-Term Measurements with Draeger-Tubes

For short-term measurements more than 160 Draeger-Tubes are available to measure the so-called spot concentrations of specific gases. A wide range of different gases and vapours can be detected and measured, e.g.: Determining and measuring concentration peaks, Measuring personal exposure in the inhalation area, Detecting leaks in pipelines, gas installations etc., and Air analysis in sewers, shafts and confined spaces.

Contains 10 tubes

Standard Measuring Range0.05 ppm Dichlorvos
Number of Strokes (n)10
Time for Measurementapp. 5 min.
Standard Deviation ±30 %
Colour Changeyellow -> red
Temperature10 to 40° C
Absolute Humidity3 to 18 mg H2O / L
Reaction Principlea) (CH23O )2PO2-CH=CCl2 + Cholinesterase
─> inactive enzyme
b) Butyrylcholine iodide + H2O ─> Butyric acid
c) Butyric acid + Phenol red ─> yellow reaction

If phosphoric acid esters are present the
enzyme is inactivated and butyric acid will not
form, thus the weak alkali solution colours the
indicating layer red and must be stable for
1 min.

If the enzyme remains active, phosphoric acid
esters are not present, and the indicating
layer remains yellow because of butyric acid
Cross SensitivityOther phosphoric acid esters than dichlorvos
are also indicated, but with different
Additional Information
After performing the required 10 pump strokes
the reagent ampoule must be broken and the
liquid transferred to the enzyme layer by
gently tapping the side of the tube. The
substrate layer must not become wet! After
waiting one (1) minute the liquid must be
carefully drawn up to the marking line onto the
indication layer using the pump.